Metal surface anti-corrosion method based on surface nanometer construct

A metal surface, anti-corrosion technology, applied in the direction of metal material coating process, solid-state chemical plating, coating, etc., can solve the problems of easy penetration, corrosion, and cracking of electrolyte solution, and achieve the elimination of cracking phenomenon, Improved hydrophobicity and simple equipment

Inactive Publication Date: 2005-07-20
XIAMEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the nanomembranes prepared by the sol-gel method are mostly porous, and are prone to defects such as cracks, which cause the electrolyte solution to easily penetrate into the metal surface and cause localized corrosion, which encounters great difficulties in practical application.

Method used

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  • Metal surface anti-corrosion method based on surface nanometer construct
  • Metal surface anti-corrosion method based on surface nanometer construct
  • Metal surface anti-corrosion method based on surface nanometer construct

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Preparation of Ultrafine TiO 2 Sol: Add 1ml of EAcAc to 20ml of absolute ethanol at room temperature and pressure, add 4mL of tetrabutyl titanate under stirring, react for 1 hour, add 0.2ml of water within 30 minutes, stir for 5 hours, then place One day, get ultra-fine TiO 2 Sol; from figure 1 The colloidal particle distribution diagram of the sol shows that TiO 2 The diameter of the colloidal particles is basically 1.00nm, and there is almost no large agglomeration phenomenon;

[0018] Pre-treatment of metal substrate surface: Grind 316L stainless steel with 1000-mesh water-grinding paper, polish with No. 10 metallographic sandpaper, and then use acetone, absolute ethanol, ultra-pure water to ultrasonically clean, dry and set aside;

[0019] Coating: immerse the metal substrate in TiO 2 In the sol, use a mechanical pulling machine to pull at a constant speed of 1 mm / s. After natural drying, repeat the pulling 3 times, put it in a muffle furnace for 30 minutes at a...

Embodiment 2～4

[0024] Nano-TiO 2 The preparation of membrane / 316L was the same as in Example 1, only the hydrothermal post-treatment time was changed, and the results are shown in Table 1.

[0025] Example

Embodiment 5

[0027] Nano-TiO 2 The preparation of film / 316L is the same as that in Example 1, nano-TiO prepared by 316L stainless steel and sol-gel method 2 Membrane / 316L and hydrophobic nano-TiO 2 Membrane / 316L electrode is used as working electrode, Pt sheet electrode is used as auxiliary electrode, reference electrode is saturated calomel electrode (SCE), electrolyte is Ringer solution, NaCl solution and HCl solution, and the electrolytic cell is placed in a shielding box during the whole test In order to reduce the interference of the outside world on the test system, the scanning range of electrochemical linear polarization is ±15mV near the corrosion potential, and the scanning speed is 0.167mV / s; the frequency measured by AC impedance method is 10 5 ~10 -3 , the results are shown in Table 2-4. It can be seen from Table 2 that the surface structure of nano-TiO 2 The corrosion resistance of the 316L stainless steel film is significantly improved, and the hydrophobic nano-TiO 2 Th...

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Abstract

An anticrossion treating process for the metal surface includes such steps as preparing ultrafine (nano-class) TiO2 sol by adding EAcAC and tetrabutyl titanate to alcohol and dropping water, preparing a decorative nano TiO2 film layer on the metal surface by pull method, hydrothermal treating, and fluorosilalkylating to obtain a hydrophobic film. Its advantages are high anticorrosion effect and easy control.

Description

(1) Technical field [0001] The invention relates to a metal surface anticorrosion treatment method, in particular to a metal surface anticorrosion method based on surface nanometer construction. (2) Background technology [0002] One of the main causes of corrosion damage to metals is due to the contact of the metal surface with the electrolyte solution or humid atmosphere, resulting in various corrosion primary cells. Metal anti-corrosion can prevent corrosion by changing the state of the metal surface and keeping the metal surface isolated from the corrosive environment as much as possible. At present, it is mainly used to modify a layer of ceramic protective film on the metal surface, such as nitrides, carbides, transition metal oxides, among which the semiconductor SiO is more successful. 2 、TiO 2 film and completely non-conductive Al 2 o 3 Membranes, or composite membranes composed of them, the corrosion resistance of metals have been improved to varying degrees. I...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C20/08
Inventor 林昌健沈广霞
Owner XIAMEN UNIV
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